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Old 07-07-2014, 05:14 PM   #1
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Meritor air dryer......

Releasing air for about 30sec, long after engine shut down .
This is the second time I've heard this. Engine had been shut down at least 40min.
Ist time I heard it was before I changed filter, today, with a fresh filter. No wonder I can lose 60psi in my tanks overnite.
Anyone else run across this?
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Old 07-10-2014, 11:25 PM   #2
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yes, but on an older 1995 winnebago Vectra.
the Vacuum generators, used brake air to provide vacuum for dash and cruise control unit. as the for valve gets old, it gets a lot of false activations.
it's a venturi type unit. I have included a photo of the unit.
I removed 2 of them ( front -rear ) plugged the air line. and added a vacuum pump to provide vacuum for the systems.
My brakes no longer his every few minutes, and my tanks stay up for 48 hrs.
my brother drives 18 whlr for Safeway stores, says if it stays up over night, your ok.. it was a big improvement as when I start it the brakes till have air and do not have to pump up..
While your rig may not have this same unit, it may have something similar.
So this may give you an idea where to look.
I hope this helps.
Dan.
kb7uxe at gmail.
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Old 07-10-2014, 11:34 PM   #3
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Thanks for the reply Dan.
I contacted the dryer manufacturer, and they confirmed if any moisture is found, the dryer will expel it, even long after the motor is shut down.

Thanks again.
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